Azarenka beats Halep to reach Qatar Open quarters

World number one Victoria Azarenka of Belarus celebrates after beating Mona Barthel of Germany in their WTA Qatar Open tennis match in Doha on.Wednesday Feb. 15, 2012. (AP Photo/Osama Faisal)

/ AP

World number one Victoria Azarenka of Belarus celebrates after beating Mona Barthel of Germany in their WTA Qatar Open tennis match in Doha on.Wednesday Feb. 15, 2012. (AP Photo/Osama Faisal)

World number one Victoria Azarenka of Belarus celebrates after beating Mona Barthel of Germany in their WTA Qatar Open tennis match in Doha on.Wednesday Feb. 15, 2012. (AP Photo/Osama Faisal) (/ AP)

The Associated Press

World number one Victoria Azarenka of Belarus returns the ball to Mona Barthel of Germany during their women's singles match at Qatar tennis open tournament in Doha, Wednesday Feb. 15, 2012. (AP Photo/Osama Faisal)

/ AP

World number one Victoria Azarenka of Belarus returns the ball to Mona Barthel of Germany during their women's singles match at Qatar tennis open tournament in Doha, Wednesday Feb. 15, 2012. (AP Photo/Osama Faisal)

World number one Victoria Azarenka of Belarus returns the ball to Mona Barthel of Germany during their women's singles match at Qatar tennis open tournament in Doha, Wednesday Feb. 15, 2012. (AP Photo/Osama Faisal) (/ AP)